Php uses the GD library to draw a star

01 $ width500; 02 $ height500; 0304 $ imimagecreatetruecolor ($ width, $ height); 0506 $ redimagecolorallocate ($ im, 230,0, 0); 07 imagefill ($ im, $ red); 0809

01 $ width = 500;

02 $ height = 500;

03

04 $ im = imagecreatetruecolor ($ width, $ height );

05

06 $ red = imagecolorallocate ($ im, 230, 0, 0 );

07 imagefill ($ im, 0, 0, $ red );

08

09 $ yellow = imagecolorallocate ($ im, 255,255, 0 );

10

11 // Set the edges of the positive Pentagon formed by the five vertices of the pentagram.

12 $ B = 100;

13 $ pi = 3.14/180;

14

15 $ p1x = 150;

16 $ p1y = 250;

17

18 $ p2x = 150 + (cos (36 * $ pi) * $ B );

19 $ p2y = 250-(sin (36 * $ pi) * $ B );

20

21 $ p3x = 150 + (2 * cos (36 * $ pi) * $ B );

22 $ p3y = 250;

23

24 $ p4x = $ p3x-sin (18 * $ pi) * $ B;

25 $ p4y = 250 + cos (18 * $ pi) * $ B;

26

27 $ p5x = 150 + sin (18 * $ pi) * $ B;

28 $ p5y = 250 + cos (18 * $ pi) * $ B;

29

30 // connect the corresponding point to draw a line

31 imageline ($ im, $ p1x, $ p1y, $ p3x, $ p3y, $ yellow );

32 imageline ($ im, $ p1x, $ p1y, $ p4x, $ p4y, $ yellow );

33

34 imageline ($ im, $ p2x, $ p2y, $ p4x, $ p4y, $ yellow );

35 imageline ($ im, $ p2x, $ p2y, $ p5x, $ p5y, $ yellow );

36

37 imageline ($ im, $ p3x, $ p3y, $ p5x, $ p5y, $ yellow );

38

39 header ('content-Type: image/png ');

40

41 imagepng ($ im );

42

43 imagedestroy ($ im );

44

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